I don't know if that would work (the dumpster idea), because oftentimes you get two guys working the route, one is in the truck while the other is
behind it, either running the lift/compactor, or throwing in assorted crap that's accumulated around the dumpster proper. He would have to be blind
to miss the cache if it's just on top of the ground where the dumpster sits.
Another place might be rooftop gardens, lots of buildings have them. They're usually accessible to all tenants, but there are a ton of places you
can hide small packages (planters, furniture, crevices in the masonry, behind exhaust vent covers, in the eaves of the stairwell enclosure, etc.). In
my experience, most city-dwellers are too busy to spend much time on the roof, they get up to go to the gym or to work, and come home just to eat,
watch some television, and go to bed so they can do it all over again. The ratio of Nancy Drew types to schlubs is heavily weighted towards the
latter in my experience.
The beach is another possibility. Obviously this only works for coastal cities, but it would be perfect for a place like NY. You could have a nice
little cache, complete with inflatable boat, hidden under the sand below one of the piers (I would avoid anything metal, because there are beach
combers with metal detectors who might discover your 'treasure chest' and deprive you of it long before Sit-X ever occurs), or weigh down a
waterproof package and attach it to the pylons at the mooring dock for the ferry.
Many large-ish buildings in major cities have furnace rooms that are reasonably accessible. Some of these furnace rooms have old furnaces that are no
longer in use, either because the building upgraded to a more efficient model, changed fuel (coal to gas is common), or decided to install individual
furnaces for the individual apartments. The same could be said for hot water heaters. It costs a fair bit of money to cut them into pieces and cart
them away, so building owners have an incentive to leave them where they sit (often these things weigh a ton). They would make excellent cache
I've been to a few cities in the US where there are still cold war bomb shelters in existence. They're disused and locked up in most cases, but
some of them are accessible and would make an ideal 'storage bin' for emergeny use. Hell, you might even be able to hole up and live there!
Most cities have abandoned lots, you know, those weed-encrusted wastelands frequented by prostitutes, drug dealers, and winos, who deposit their trash
and move on. The trash never seems to get cleaned up, which is a good sign if you're looking for a cache site. I remember a couple of these areas
in Chicago, on the North and West side, that were paved over with asphalt. Where the asphalt met the concrete of the sidewalk, there were always
loose sections, some of them quite large. One could jack a couple of those puppies up, remove some material from underneath (dirt and sand), and have
a nice little hidey-hole that would probably go unnoticed for years.
The hard part would be doing it quickly and quietly, so none of the neighbors see what you're doing. Find the blighted industrial part of town, and
make sure to work during the magic hour, after the bar crowd has gone home, but before the crackheads and laborers hit the streets in the pre-dawn
hours (it depends on where you live, when the bars close).
If you've got the marbles for it, you could choose to work in a gang-infested part of town instead, because most of the neighbors mind their business
for fear of reprisals - they see a dark figure wearing a hoody, burying something in the lot across the street at 4am, they're probably not going to
want to know any more than they already do.
After thinking about it a bit more, I've come to the conclusion that a car parked somewhere secure might be one of the best choices for average
people of average means. It provides transporation in cases where bugging out is an option, and a large storage capacity if you just need to pick
some stuff up, but can't leave the area in a vehicle. When shopping for a car, pretend you're a mafioso; the car should be unremarkable,
inexpensive but not an eyesore, and it should have a really, really big trunk.
Whatever you do, I can't stress enough how irresponsible it would be to hide a firearm or any sort of weapon somewhere another person could find it.
It would be incredibly foolish, not to mention illegal and immoral. So don't do it. Just don't do it. Secure your firearm(s) as you would your